The router can be
booted using any of the following:
single software image containing a full collection of software packages. This
mode provides a simplified installation and can be stored in the bootflash, a
TFTP server, or a network server.
or more sub-images extracted from the consolidated image. This mode provides
optimized memory usage and requires that you store files in the bootflash
Provisioning files manage the boot process
when the router is configured to boot in sub-packages. The provisioning file manages the
bootup of each individual sub-package. Provisioning files are extracted automatically
when individual sub-package files are extracted from a consolidated package.
Provisioning files are not necessary for running the router using the complete
File Systems on the Cisco ASR 920 Series Router
The table below provides a list of file systems that can be seen on the
Cisco ASR 920 Series Router.
Table 1 File Systems
The boot flash memory file system.
The Cisco Networking Services file directory.
Router NVRAM. You can copy the startup configuration to NVRAM
or from NVRAM.
The system memory file system, which includes the running
The archive file system.
The temporary system files file system.
The Universal Serial Bus (USB) flash drive file systems.
If you see a file system not listed in the table above, enter the
? help option or see the
copy command reference for additional
information on that file system.
The following sections describe the system requirements for the Cisco ASR 920 Series Router software:
These are the recommendation for the Cisco ASR 920 Series Router for the Cisco IOS XE 3S images and packages:
DRAM Memory—4 GB
Software Image—asr920-universalk9_npe.bin—270 MB
file in the bootflash: directory should not be deleted, renamed, moved, or
altered in any way unless directed by customer support; altering these files
can have unpredictable consequences for system performance.
Table 2 Autogenerated
file may appear in the bootflash: file system.
files are useful for tuning and troubleshooting, but are not related to router
operations: you can erase them without impacting the router’s performance.
bootflash/core directory is the storage area for .core files.
Do not erase or move the core directory.
directory is created on bootup if a system check is performed. Its appearance
is completely normal and does not indicate any issues with the router.
area for trace files is bootflash/tracelogs.
are useful for troubleshooting; you can access trace files using diagnostic
mode to gather information related to the IOS failure.
No new or modified standards are supported, and support for existing standards has not been modified.
No new or modified MIBs are supported, and support for existing MIBs has not been modified.
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:
No new or modified RFCs are supported, and support for existing RFCs has not been modified.
The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.